Lessons Learned in Implementing the Extended Date/Time Format in a Large Digital Library

Hannah Tarver, Mark Phillips


In 2012, the University of North Texas (UNT) Libraries implemented the Library
of Congress Extended Date/Time Format (EDTF) into the metadata guidelines for their digital holdings
which now contain more than 460,000 records. This paper discusses the evaluation process to identify
the number of previously-existing dates that meet EDTF standards and those that need to be edited for
conformance. It also outlines practical steps used for implementing the standard, such as date
validation for metadata creators and changes to date displays for public users. Finally, it presents
some of the challenges encountered during the implementation process and considerations for other
institutions that may want to use the EDTF.

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